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Brake control device

Active Publication Date: 2017-02-09
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is aimed at providing a brake control device that can operate quickly even when the car's ignition switch is turned off, while lessening the strain on the car's battery.

Problems solved by technology

When the system is started as described above, however, a certain length of time is required to start the system.
Therefore, a problem of responsiveness occurs.
On the other hand, in view of reduction in power consumption, it is not desired to maintain a startup state of the brake system over a long period of time while the ignition switch is in the OFF state.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0079]The first embodiment is described referring mainly to FIG. 5.

[0080]In the first embodiment, when the system end conditions are satisfied, the power-supply interruption control is executed to interrupt the vehicle power source E and supply the necessary electric power from the auxiliary power source 12. In this manner, the power-supply interruption control is continued by the master-pressure control device 3 until the electric power stored in the auxiliary power source 12 is depleted.

[0081]An example of a control flow for executing the power-supply interruption control according to this embodiment is illustrated in FIG. 5. Referring to FIG. 5, in Steps S50 to S53, the same processing as that performed in Steps S11 to S14 illustrated in FIG. 3 is performed. Then, when it is determined in Step 51 that the vehicle power source E does not fail, that is, when it is determined that the vehicle power source E is normal and the electric power is supplied from the vehicle electric power...

second embodiment

[0085]In the second embodiment, when the system end conditions are satisfied, the power-supply interruption control is executed to interrupt the vehicle power source E and supply the necessary electric power from the auxiliary power source 12 to the CPU 211 and the monitoring control circuit 219 when the amount of electric power (amount of charge) of the auxiliary power source 12 is equal to or larger than a given amount, so as to reduce the electric power consumption. Further, when the operation of the brake pedal 100, the operation of the master-pressure control device 3 is made possible immediately.

[0086]An example of a control flow for executing the power-supply interruption control according to this embodiment is illustrated in FIG. 6. Referring to FIG. 6, in Step S64 corresponding to Step S54 of the first embodiment, when the system end conditions have been satisfied, the power source is switched from the vehicle power source E to the auxiliary power source 12 in Step S65 so a...

third embodiment

[0088]In the third embodiment, when the system end conditions are satisfied, the power-supply interruption control is executed to interrupt the vehicle power source E and supply the necessary electric power from the auxiliary power source 12 to the CPU 211 and the monitoring control circuit 219. In this manner, the electric power consumption is reduced for a predetermined period of time and, when the operation of the brake pedal 100 is detected, the master-pressure control device 3 can operate immediately.

[0089]An example of a control flow for executing the power-supply interruption control according to this embodiment is illustrated in FIG. 7. Referring to FIG. 7, in Step S74 corresponding to Step S54 in the first embodiment, when the system end conditions have been satisfied, the power source is switched from the vehicle power source E to the auxiliary power source 12 in Step S75. In Step S76, it is determined whether or not a predetermined period of time has elapsed after the con...

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Abstract

With the use of electric power supplied from a vehicle power source, an electric motor is controlled based on a movement amount of an input rod by a master-pressure control device. A primary piston is thrust through an intermediation of a ball-screw mechanism to generate brake fluid pressure in a master cylinder. The brake fluid pressure generated by the master cylinder is fed-back by an input piston through an intermediation of the input rod to a brake pedal. When system end conditions such as the OFF state of the ignition switch are satisfied, the master-pressure control device executes power-supply interruption control to interrupt the vehicle power source and supply necessary electric power from an auxiliary power source, to thereby continue brake control with electric power stored in the auxiliary power source.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a continuation-in-part application of a U.S. patent application Ser. No. 13 / 626,345, filed Sep. 25, 2012, which is incorporated by reference herein in its entirety and to which priority is claimed.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]The present invention relates to a brake control device which is actuated by using an electric motor as a driving source.[0004]2. Description of the Related Art[0005]For example, as described in International Publication No. WO2010 / 113574, as a brake control device for an automobile, there is a brake control device for generating a servo force by using an electric motor as a driving source in accordance with an operation of a brake pedal, which is performed by a driver, to perform braking.[0006]It is desired that the brake control device for an automobile can be actuated even when an ignition switch is in an OFF state. Therefore, in the electric brake control device described above...

Claims

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Application Information

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IPC IPC(8): B60T13/74F16D65/18
CPCB60T13/745F16D2125/36F16D2121/24F16D65/18B60T13/686B60T7/042B60T13/166B60T13/662B60T8/4872
Inventor MURAKAMI, SHOHKONISHI, YASUFUMI
Owner HITACHI ASTEMO LTD
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